<?php
/*
 * *	FILE NAME: 	Security.php 	(Last Update: 27 OCTOBER 2011)
 * * 	DESCRIPTION: Functions for handling form input
 * *	 
 * *	LICENSE:	
 * *
 * *	@programmer	-
 * *	@license	
 * *	@version	Release: @1.0@
 * *	@link		http://www.commercialasia.com/package/packagename
 * *	@since		File available since Release 1.0
 * *
 */

class Security {

    public static function cleanXSS($data) { // Fix &entity\n;
        if (!is_array($data)) {
            $data = str_replace(array('&amp;', '&lt;', '&gt;'), array('&amp;amp;', '&amp;lt;', '&amp;gt;'), $data);
            $data = preg_replace('/(&#*\w+)[\x00-\x20]+;/u', '$1;', $data);
            $data = preg_replace('/(&#x*[0-9A-F]+);*/iu', '$1;', $data);
            $data = html_entity_decode($data, ENT_COMPAT, 'UTF-8');

            // Remove any attribute starting with "on" or xmlns
            $data = preg_replace('#(<[^>]+?[\x00-\x20"\'])(?:on|xmlns)[^>]*+>#iu', '$1>', $data);

            // Remove javascript: and vbscript: protocols
            $data = preg_replace('#([a-z]*)[\x00-\x20]*=[\x00-\x20]*([`\'"]*)[\x00-\x20]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2nojavascript...', $data);
            $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iu', '$1=$2novbscript...', $data);
            $data = preg_replace('#([a-z]*)[\x00-\x20]*=([\'"]*)[\x00-\x20]*-moz-binding[\x00-\x20]*:#u', '$1=$2nomozbinding...', $data);

            // Only works in IE: <span style="width: expression(alert('Ping!'));"></span>
            $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?expression[\x00-\x20]*\([^>]*+>#i', '$1>', $data);
            $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?behaviour[\x00-\x20]*\([^>]*+>#i', '$1>', $data);
            $data = preg_replace('#(<[^>]+?)style[\x00-\x20]*=[\x00-\x20]*[`\'"]*.*?s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:*[^>]*+>#iu', '$1>', $data);

            // Remove namespaced elements (we do not need them)
            $data = preg_replace('#</*\w+:\w[^>]*+>#i', '', $data);

            do {
                // Remove really unwanted tags
                $old_data = $data;
                $data = preg_replace('#</*(?:applet|b(?:ase|gsound|link)|embed|frame(?:set)?|i(?:frame|layer)|l(?:ayer|ink)|meta|object|s(?:cript|tyle)|title|xml)[^>]*+>#i', '', $data);
            } while ($old_data !== $data);
        }//end if
        // we are done...
        return $data;
    }
//end function

    public static function striper($form) {
        foreach ($form as $key => $value) {
            $form[$key] = strip_tags($value);
        }//end foreach loop
        return $form;
    }

//end function
}//end class